My gelding was running around in our pasture a couple days ago and then I noticed after he stopped running he held his leg up and appeared to be lame in his right rear hoof. I checked it out and he had a crack in his toe that was about an inch. The crack is sideways and veers off to the right. The crack reaches into his sole and is about the same length as the outside crack on his wall. He was bleeding when it happened and I thought it might be an abscess but I don't think so now. He limps around on it but he is getting a little bit better.
Why would he get such a crack from simply running around? How can I treat it?